import { Light } from './Light';

import { PerspectiveCamera } from '../cameras/PerspectiveCamera';

import { LightShadow } from './LightShadow';

/**

* @author mrdoob / http://mrdoob.com/

*/

function PointLight( color, intensity, distance, decay ) {

Light.call( this, color, intensity );

this.type = 'PointLight';

Object.defineProperty( this, 'power', {

get: function () {

// intensity = power per solid angle.

// ref: equation (15) from http://www.frostbite.com/wp-content/uploads/2014/11/course_notes_moving_frostbite_to_pbr.pdf

return this.intensity * 4 * Math.PI;

},

set: function ( power ) {

// intensity = power per solid angle.

// ref: equation (15) from http://www.frostbite.com/wp-content/uploads/2014/11/course_notes_moving_frostbite_to_pbr.pdf

this.intensity = power / ( 4 * Math.PI );

}

} );

this.distance = ( distance !== undefined ) ? distance : 0;

this.decay = ( decay !== undefined ) ? decay : 1; // for physically correct lights, should be 2.

this.shadow = new LightShadow( new PerspectiveCamera( 90, 1, 0.5, 500 ) );

}

PointLight.prototype = Object.assign( Object.create( Light.prototype ), {

constructor: PointLight,

isPointLight: true,

copy: function ( source ) {

Light.prototype.copy.call( this, source );

this.distance = source.distance;

this.decay = source.decay;

this.shadow = source.shadow.clone();

return this;

}

} );

export { PointLight };